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Gamma-ray Large Area Space Telescope: Calorimeter Module Schedule & Testing Plan

This report details the completion schedule, testing plan, and critical paths for the Calorimeter modules of the Gamma-ray Large Area Space Telescope. It covers cable testing, environmental testing, and integration timelines. Emphasis is on implementing cable specifications, managing testing schedules, and addressing potential concerns to maintain the project timeline.

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Gamma-ray Large Area Space Telescope: Calorimeter Module Schedule & Testing Plan

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  1. Gamma-ray Large Area Space Telescope Cost/Schedule Reports for 4.1 LAT Presentation May 2005 Month End

  2. Calorimeter Finished !! • Last of the 18 Calorimeter modules has been accepted by I&T • Plan to close the 4.1.5 Calorimeter accounts at the end of July • Final report at the August monthly • Outstanding balances will be transferred to other WBS elements • Any redistribution of funds will be handled with subsequent CCB actions • Neil Johnson will continue to be responsible for the LAT funds at NRL

  3. Phase E Budget

  4. Module Schedule

  5. LAT Schedule

  6. Current Critical Path to Ship LAT to Spectrum Astro Elex: SIU/EPU Box Integration 11/8/05 Elex: LCB/CPS/BP Fab for Flight 9/21/05 Elex: SIU/EPU 1-5 RFI 11/8/05 Elex: LCB/SIB/CPS/BP Fab for Proto-flight 8/24/05 Online Software 11/18/05 Integrate LAT-Wide Electronics 11/10/05 System Test 2/3/05 Integrate ACD 12/1/05 Integrate X-Lat Thermal Plate 12/2/05 Environmental Test 5/12/06 Ship LAT to Spectrum Astro 5/14/06 Float 10 days Pre-Environmental Test Review 2/6/06

  7. Current Critical Path to Ship LAT to Spectrum Astro ● 1st critical path: Electronics SIU/EPU Components for Proto-flight 10 days float to Ship LAT to Spectrum Astro ● 2nd critical path: Electronics PDU Assembly for Flight 27 days behind 1st critical path ● 3rd critical path: Electronics FSW FQT 1 day behind 2nd critical path ● 1st critical path to 8 Tower CPT: Tracker Tower 6 Cables

  8. Tracker Cables • Emilio hand carried 9 cables to Pisa • Module 6 has all of the cables except C7 • Module 7 has C0 to C4 and a C6 (with rejected coupon) • 2 – C7 cables and a C5 (with rejected coupon) hand carried to Pisa on Sunday • Module 6 & 7 will have a full complement of cables on Monday • Two module 7 cables with rejected coupons

  9. Prospects for cables • Parlex • Bruce Foshay of BMG consulting is at the facility • Phil Goodwin is at the facility today • They are putting together the numbers of cables failing for each reason to get a handle on the effect of relaxing tolerances • In particular, they are getting the number of cable panels that are in quarantine and the cause of rejection • Working on specifications on a case by case basis • Reduce the annular ring requirement from .002” to .001” • Loosen tolerance on over and under etch of traces from to • Accept cracks in connectors • Engineering evaluation that risk is low and cables are redundant • Need support from the mission office • Pioneer • Recent slip in schedule from all cables August 1 to some cables by mid August and rest by the end of August • Project Manager has call into Pioneer management • Robert Johnson (and Project Manager if needed) visit to Pioneer next week

  10. Pioneer Schedule • LAT-DS-02377-05 • LAT-DS-02378-03 First Article8/19/05 • LAT-DS-02379-02 1st Release8/19/05 • LAT-DS-02380-02 2nd Release8/25/05 • LAT-DS-02381-02 3rd Release8/31/05 • LAT-DS-02382-02 4th Release9/7/05 • LAT-DS-02383-02 • LAT-DS-02384-03

  11. Tracker Testing • Modules 6&7 will go through environmental testing with complete sets of cables • After that, it is likely that modules will be ready for environmental testing but missing some cables • The mission office has recommended that we test and then add missing cables when they become available • A full functional test and a limited alignment check will be done after adding the cables • This maintains a regular schedule at Alenia and the inventory of modules awaiting cables will be kept at Pisa • Concerns regarding this plan • The configuration will be broken post test without retest • This plan needs to be vetted with code 300 • The sidewall fasteners will not be staked during vib with a risk of fasteners backing out and damaging hardware • This could be mitigated by doing a sine sweep to characterize the module but not full level vibration • Functional testing of the module before, during and after vib will be limited to the available cables • Some connectors will not be mated during vib and could become contaminated • If this is deemed to be a problem the open connectors could be covered with tape • Some MCMs may not be powered during thermal-vac testing • The gradients in the tracker are small and the main thermal induced stresses are due to the average temperature

  12. Tracker environmental testing schedule

  13. Cable delivery impact on LAT schedule • Modules through environmental test by mid September • Feasible that all cables will be available by then • Including installing cables, functional test, and acceptance test the 16th module should be RFI before mid October • This leaves the tracker about 4 weeks off the critical path to the June 1 LAT delivery milestone • Mitigation • Review the integration sequence in a month to assure that the towers under the key DAQ boxes are installed earlier

  14. Level 1-2 Milestone List

  15. Level 3 Milestone Count

  16. Level 3 Milestones Completedin May 2005

  17. Level 3 Milestones Completedin May 2005

  18. Level 3 Milestones Completedin June 2005

  19. CPR Level 3

  20. FTE Report (DOE/NASA-funded only)

  21. Worse than .85 Between .95 and 1.10 Between .85 and .95 Better than 1.10 SPI and CPI Change Thresholds Performance Analysis LEGEND BAC: Budget At Complete SV $: Schedule Variance = BCWP - BCWS % BCWS: Percent Scheduled = BCWS/BAC BCWS: Budgeted Cost of Work Scheduled (to date) CV $: Cost Variance = BCWP - ACWP % BCWP: Percent Complete = BCWP/BAC BCWP: Budgeted Cost of Work Performed (to date) SPI: Schedule Performance Index = BCWP/BCWS % ACWP: Percent Spent = ACWP/BAC ACWP: Actual Cost of Work Performed (to date) CPI: Cost Performance Index = BCWP/ACWP Cpi_Fcst: CPI (to date) EAC Forecast = BAC / CPI CpiSpi_Fcst: Combination CPI and SPI EAC Forecast = ACWP + (BAC - BCWP) / (CPI *SPI)

  22. Variance Analysis Current Month Feb05

  23. Budget, Cost, Funding, Performance

  24. Cost Report

  25. Lien List

  26. Summary • Calorimeter complete • ACD complete • Entering environmental test • Mechanical hardware complete • Entering environmental test • Tracker assembly going well except for cables • MCMs near complete • DAQ is in early manufacturing • TEM/TEMPS are ahead of I&T • I&T going smoothly • Reacting well to changing environment • Funding for FY05 is tight • June 1, 2006 delivery is under threat of DAQ box delivery and TKR cable delivery

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